drm/vc4: Use managed KMS polling to fix UAF on unbind
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Use managed KMS polling to fix UAF on unbind vc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides no matching drm_kms_helper_poll_fini(). The output poll work stays scheduled after unbind and runs on the freed drm_device: # modprobe vc4; rmmod vc4; sleep 10 BUG: KASAN: slab-use-after-free in delayed_work_timer_fn BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm] Workqueue: events output_poll_execute [drm_kms_helper] Allocated by task 171: __devm_drm_dev_alloc Freed by task 262 (rmmod): drm_dev_put / component_del Use drmm_kms_helper_poll_init() so polling is finalized with the device, as other drivers do.
CVE-2026-98309
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98309
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
"lessThan": "b6beee927e7f4e3142032ff91b2d0417cdddc0f6",
"versionType": "git"
},
{
"status": "affected",
"version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
"lessThan": "cf0c4432bda37b02e7d430ff5017228ceb7caf0c",
"versionType": "git"
},
{
"status": "affected",
"version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
"lessThan": "ee507691c18f9fee5d4751e295ab9a7ff31d59ae",
"versionType": "git"
},
{
"status": "affected",
"version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
"lessThan": "7f9780df677370a19b4ec9764f13b1b82073e0d9",
"versionType": "git"
},
{
"status": "affected",
"version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
"lessThan": "073a30d75f309812ed61af134f24ffef4107b13a",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/vc4/vc4_kms.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/vc4/vc4_kms.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98309
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38388 · Revision 1
- Added to Heist Feed
- Publisher date